Review on Mi TDS Pen Water Quality Tester by Dorota Struszewska ᠌

Ordered through , brought the next day (surprisingly). The device did not turn on at first, I already thought that it was a marriage, but it turned out to be dead native batteries. After replacing it, it started right up. Naturally, I tested all the water. I bought it just to check the quality of the reverse osmosis filter. To begin with, I checked it with distilled water, the device showed 0. I checked on the water from the old osmosis, where the mineralizer ended - 11. New osmosis with mineralizer - 90. From the tap - 296. Mineral water Esentuki 17 - 4000+. Exceeded expectations, thought it would be uncalibrated and prepared for the worst :) : after the first turn on, I decided to re-check the water and the device did not turn on.